| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.12 056/106] block: disable runtime-pm for blk-mq | Date | Wed, 9 Aug 2017 09:52:40 -0700 |
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4.12-stable review patch. If anyone has any objections, please let me know.
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From: Christoph Hellwig <hch@lst.de>
commit 765e40b675a9566459ddcb8358ad16f3b8344bbe upstream.
The blk-mq code lacks support for looking at the rpm_status field, tracking active requests and the RQF_PM flag.
Due to the default switch to blk-mq for scsi people start to run into suspend / resume issue due to this fact, so make sure we disable the runtime PM functionality until it is properly implemented.
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Cc: Oleksandr Natalenko <oleksandr@natalenko.name> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- block/blk-core.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/block/blk-core.c +++ b/block/blk-core.c @@ -3307,6 +3307,10 @@ EXPORT_SYMBOL(blk_finish_plug); */ void blk_pm_runtime_init(struct request_queue *q, struct device *dev) { + /* not support for RQF_PM and ->rpm_status in blk-mq yet */ + if (q->mq_ops) + return; + q->dev = dev; q->rpm_status = RPM_ACTIVE; pm_runtime_set_autosuspend_delay(q->dev, -1);
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